Settings Cleanup and Reorganization

Change-Id: I9bd56cfb2689985c2c94273e2058c10c89d21858

Conflicts:
	res/xml/accessibility_settings.xml
	res/xml/security_settings_chooser.xml
	res/xml/security_settings_lockscreen.xml
	res/xml/security_settings_password.xml
	res/xml/security_settings_pattern.xml
	res/xml/security_settings_pin.xml
	src/com/android/settings/SecuritySettings.java
	src/com/android/settings/accessibility/AccessibilitySettings.java